Has the lowest annual average temperature taiga the

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Chapter 20 / Exercise 04
Exploring Economics
Sexton
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Has the lowest annual average temperature?
The University of Minnesota’s Cedar Creek Research Reserve contains all three of these habitats and as a result is quite diverse in plant and animal species. Cedar Creek contains more than 100 fields that have been abandoned from agriculture. The time since abandonment ranges from 1927 to the present. Fields last cultivated in the 1970s or more recently are dominated by more weedy species of grass such as Kentucky Bluegrass, Quackgrass, and Crab Grass as well as forbs such as Ragweed and Horseweed. Fields that were abandoned in the 1950s are now dominated by longer lived Little Bluestem Grass, and many of these fields been invaded by White Pine from surrounding upland forests. What are 2 biological traits that might be associated with species such as bluegrass or ragweed? (note I am not asking for a term that would characterize these species) (2)
2 What are 2 biological traits that might be associated with white pine? (same note applies) (2)
2 In the space on the right, draw the logistic growth curve making sure to label each axis and K and then indicate which region of the plot you drew would most likely represent the population growth pattern of bluegrass seen early in the successional process and which region would most likely represent the population growth pattern of white pine seen late in the successional process (4) Which of the two species in the previous question would most likely be affected by density-dependent factors? (2)
In mature Prairie communities, one of the most spectacular mid- summer species of forb is Butterfly Weed which has showy orange flowers that attract thousands of Hairstreak Butterflies. What type of successional interaction is occurring between these two species?
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Chapter 20 / Exercise 04
Exploring Economics
Sexton
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As discussed in class, Cedar Creek is additionally the site of a long term, ongoing experiment in grassland community dynamics consisting of multiple 1 hectare plots in which the species number of grasses and forbs are experimentally manipulated but all other conditions are similar. The data on the lower right show total percent cover as a function of species number (graph A) and annual variability in primary production as a function of species number (graph B). Which graph A or B provides information on the relationship between species diversity and community stability and what do the data suggest about the relationship between these 2 factors? (2) Plot B. the data show that community stability increases with increasing diversity There are no venomous snake species found within the prairie habitats in Cedar Creek but a non- venomous species, the bull snake, is present. When threatened the snake may coil up and shake its tail in the dry grass raising the specter of an impending rattlesnake strike (see figure on the right). What type of mimicry does this represent? (2)

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